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Latest commit 1654720 May 26, 2016
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Dockerfile Update Dockerfile May 26, 2016 Create May 26, 2016
crontab initial commit May 26, 2016 initial commit May 26, 2016


A simple docker container that runs a cron invoking a shell script.

how to install and use it

Copy the repository and build from the Dockerimage:

$ sudo docker build --rm -t docker-cron .

Run the docker container in the background (docker returns the id of the container):

$ sudo docker run -t -i -d docker-cron

To check if it is running properly, connect to the container using the id and view the logfile. (You may have to wait 2 minutes)

$ sudo docker exec -i -t b149b5e7306dba492558c7024809f13cfbb616cccd0f4020db61bf715f4db836 /bin/bash
root@b149b5e7306d:/# cat /var/log/cron.log
Thu May 26 13:11:01 UTC 2016: executed script
Thu May 26 13:12:01 UTC 2016: executed script

The cron job is running. Now let's modify the interval and the actual job executed!

how to modify

To change the interval the cron job is runned, just simply edit the crontab file. In default, the job is runned every minute.

* * * * * root /

To change the actual job performed just change the content of the file. In default, the script writes the date into a file located in /var/log/cron.log.

echo "$(date): executed script" >> /var/log/cron.log 2>&1

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